Improvement in tanning



UNITED STATES ATENT J. BRAINERD AND WM. H. BURRIDGE, OF CLEVELAND, OHIO.

IMPROVEMENT IN TANNING.

To aZZ whom it may concern Be it known that we, JEHU BRAINERD and WVILLIAM H. BURRIDGE, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented new and useful Improvements in Tanning; and we do hereby declare that the following is a full and complete description of the same and of the ingredients employed therein.

The nature of our invention relates to the us of the herein-named mineral salts or their solution, whether the same be used in the manner set forth in a patent granted to us on the 7th day/of June, 1859, or'whether the said salts or their solutions be used in any stage of the process of tanning or mixed with solutions of tannin, as hereinafter set forth, either with or without the addition of aloes.

WVe prepare an infusion or decoetion in a close vessel from hoarhound, (Mm-Tubman culgarey) motherwort (Leommus cardiaca) or other species of the Labz'atce, or from catechu, (Term japonicca) or from the barks commonly used in tanning, or a mixture of these. To every gallon of the strong liquor thus prepared we add half a pound of common salt, (N 2.01,) half a pound ofalum, (AI,O 3SO KOSO +24HO, and one fluid ounce of chloride of zinc, (ZnCl+Aq.) It is not, however, important to preserve the exact proportions herein named, for either of these ingredients may be varied in its proportion to the others without materially changing the result. For tanning soft leather, from onehalf to one ounce of pulverized aloes may be added.

The compound prepared as above constitutes our tanning-liquor.

Skins or hides that have been fitted for tanning in the ordinary way can be tanned by immersion in this compound in from six to forty days, according to the thickness of the skins or hides and strength of the liquor.

In carrying forward this process it Will be found necessary to transfer the skins or hides to vats containing strong liquor, after that into which they have been first immersed has be come exhausted, and to repeat this till they havebecome thoroughly tanned; or the liquor in the vats may be recruited in strength by adding new ingredients. found advisable to give skins and hides their first immersion in a liquor that has been partially exhausted of its strength by previous immersion of skins or hides therein. It will also be found advantageous to frequently handle. the skins and hides during their immersion in the vats.

WVhat we claim as our improvement, and desire to secure by Letters Patent, is

The use of the hereiirdescribed compound for tanning, consisting of a solution of the herein-named mineral salts in mixture with a solution of tannin, either with or without the addition of aloes.

J. murmurs). W. H. BURRIDGE.

It will generally be- 

